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<br />, : I I~ <br />I. ~I Ii <br /> <br />r}'-I <br />, <br /> <br />Republican River Basin <br /> <br />Description. The Republican River enters <br />Nebraska in the extreme southwestern corner of <br />the state from Colorado and enters Kansas near <br />the town of Superior, Nebraska. Major tributaries <br />of the Republican River include the Frenchman <br />River, Driftwood Creek, Red Willow Creek. <br />Medicine Creek. and Sappa Creek.. <br />The valley of the river is narrow at the western <br />border as it flows through high plains. It gradually <br />widens toward the eastern or lower end of the <br /> <br />basin passing through a narrow extension of the <br />Sandhills into flatter dissected plains. <br />Precipitation varies from an annual average of <br />18 inches in the western part of the basin to 22 <br />inches in the eastern part34 and is usually not <br />distributed well for optimum crop growth. The <br />streamflow in the tributaries 01 the Republican <br />River vary accordingly with precipitation with the <br />exception of those streams coming out 01 Ihe <br />Sandhills. which flow fairly steadily. Mean annual <br />discharge to the Republican River is approxi- <br />mately 64.559 acre-feet with a subsequent mean <br />annual outflow of 251.974 acre-feet.35 <br /> <br /> TOTAL MONTHLY STREAMFLOW IN ACRE-FEET" <br /> (INFLOW) REPUBLICAN RIVER AT BENKLEMAN (1947,19801 <br /> Jan. Feb. March April May June <br />High 7.892 9.130 33.087 13.918 20.259 22.699 <br />Low 2.819 3.891 5.527 3.327 1.803 1.288 <br />Mean 5.801 6,676 8.547 7.228 6.882 6.035 <br /> July Aug. Sept. Oct. Nov. Dec. <br />High 29.359 IS.301 22.376 7.150 7.835 7.771 <br />Low 40 28 58 550 2.776 3.534 <br />Mean 3.319 2.734 2.698 3.581 5,408 S.646 <br /> <br />(OUTFLOW) REPUBLICAN RIVER NEAR GUIOE ROCK (19S0-1980) <br /> <br />Jan. Feb. March April May June <br />36.143 54.548 66.224 147.824 154,431 215,423 <br />2.700 4.081 4.355 3.672 1.970 1.621 <br />10.660 17.699 22.378 25.689 27,129 37.934 <br />July Aug. Sept. Oct. Nov. Dec. <br />264.368 10S.309 214.417 127.502 72.779 38.255 <br />1,432 2.389 1.926 732 853 4.008 <br />36.394 16.235 20.640 13.575 11.118 10.521 <br /> <br />High <br />Low <br />Mean <br /> <br />High <br />Low <br />Mean <br /> <br />Figures rounded 10 nearest Nhole number. <br /> <br />There are apprOXImately 2.5 million acres of <br />sods In the basin which are suitable for irngatlon. <br />and where adequate water is available. Irrigation <br /> <br />is practiced.J7 Much 01 the land. however, is used <br />for grassland and nonlrrigated cropland due to <br />lack of a reliable supply of water. <br /> <br />1-19 <br />